Tension device



RQE. NAUMBURG.

TENSION DEVICE. s 'APPIQICATION FILED OCT. 8; 1921.

' EASM 16G Pate medNov. 28,1922.

2 SHEETS-SHEET l.

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machine, although it is useful in many dif-' s wide limits,-and it-is important that there" should be a tension device between the bobbin Patented Nov. 28, 1922.,

i uNirsosrarss mam, *orr csy ROBERT E. NAUMBURG, or wnvcnnsrnn', .nassacnu'snr rs, ASSIGNOR TO sAoo- LOWELL snors, or LOWELL, massacnusnrrs, A conronarron or "MASSA- CHUSETTS.

Tension DEVICE.

' Application-filed. October 8, 1921. Serial No; 506,40.-

To all'whomitmayc'oncern:

Be it known that I, ROBERT E. NAUMBURG, a citizen of the United States, and a resident of Winchester, county of Middlesex', and Commonwealth of Massachusetts, have invented certain new and useful Improvements in Tension Devices, of which the followlng is a specification.

This invention relates'to a thread or yarn tension device. I shall illustrate and de-'- scribe the inventionas applied to a spooling ferent kinds of machines which require tens10n devices, such as sewing, winding and other'textile machinery.

In the handling of thread or yarn in such machines, there are numerous diiiiculties' which'make a suitable tension device a mat-- ter of considerable importance. In a spooling machine, fo'rexample, the, drag 'ot the yarn'a's it leaves the bobbin varieswithin and the spool whieh will makethe tension on the thread as it' is wound on the spool as uniform as possible throughout the. operation,

" inorder to? obtain a firmly Wound "spool. 1 Also as the body of yarn on the spool in creases in diameter during the winding op- 0 eration, the revolution ofthe spool being con stant, the surface speed of the yarn increases, causing a greater tGIlSl'OII on the outerlayers of yarn than on the inner layers. This varia-- tion in the surface speed'of the yarn must be compensated for by the tensien device without undue strain on the yarn. Again, when the traverse mechanism of the spooling "machine reaches "the top or the bottom of its stroke, it changes its direction of move'r'nent' abruptly, causing a sudden strain on the yarn, which with *the ordinary tension devices now in use is the cause of frequent breaka'ges. It is advisablethat the tension device should be so organizedthat the normal tension on the'yarn can be easilyvar'iedac cording to the fineness of the yarn, and also? that a series of tension devices can bexadj'usted uniformly by comparatively;unskilled persons. Furthermore, all yarns have uneven places which must passthrough the tension device, and the tension device should permit the passage of such uneven places without undue strainon the yarn.-

' Among other advantages, my new im "persons. a

the nvention is described.

"provement embodies means whereby both changes in tension as the yarn leaves the bob- "bin and variations in surface speed of the yarn on the spool are quickly compensated" are prevented, and uneven places in the yarn arepermitted toipass through the tension device without strain on the yarn. Furthermore, my new'tension device is'so organized that thetension on the thread can be easily varied, and a series ofsuchtensiondevices can be'easily adjusted uniformly by unskilled ther advantages will appear as Fig. 1 is a side elevation partly in section,

'of my device in place on a spooling machine.

Fig. 2-is a plan view of the device. Fig. 3 is a front elevation'ofone form of my device.

Fig. ashows thedevice otFig. 3 with the cup" or disk tilted in a somewhatexaggerated mannertoillustrate the action'of the device under certain conditions. Fig. 5 is a front elevation of the preferredform of my device with certain parts in section. Fig. 6

shows the device of Fig. 5 With the cup or disk tilted in somewhat exaggerated form to show the action :of the device under cer tain conditiohsLfFigy'? is a sectional'view of apreferred form of cup; 1 Referring toFigs; 1, 2,5 and 6, attached to the usual'guide rail 1 by clamp 2 is the supportingmember 3'. I A pin 4 is inserted in the. supporting member 3'. and held in place by'a set screw 5. Acylindrical cap 6 is supported on the pin and threaded thereto as shown at 7. Mounted on thepin'isa disk or cup 8, preferably concavoconvex inform 1 as shown in Figlfl, and with its convex surrase normally resting on the supporting member. -Resting on the concave face of this disk is the "spiral compression'spring 9, shown as tapered at 10. On the top of the spring the disk 11, and resting on said disk 11 and mounted on the pin are any desired number of removable weights or washers 12,12. The spring 9 as shown is "ofspecial shape, being tapered at 10 so that at this pointit is wound closely around the pin, thereby keeping its axis in line with the center of the pin. Below point 10 the spring I increases in diameter until it is substantially the same indiameter asthe inside ofv the lower disk. Above point 10 the spring is expanded somewhat to make a bearing and friction surface against the under side of disk 11. This cup 11 may be omitted entirely in this form of my invention, permitting] the weights 12, 12 to rest directly'on the spring 9.

The disk 8 is made of thin, light metal and should have a loose fit on the'pin'and have no barrel or collar, so that it Joe easily and freely tilted sidewise. As shown it has a protruding"bearing surface 13 and is recessed at the center at ML The yarn 15, is drawn from :hobbin 16 over the supportinginember atlfi (see Fig. 2),

7 under the disk 8, and thence over the guide rail 1, through the .stubtateherflorqthread guide 18; to the spool "19,:in the ordinary inannenasshown 1. I-fathiclmplace, 20- the disk, the disk willbe tilted and the 1 support will lee-shifted as shown in Fig. 6.

a bunch orfla sluh in the yarn passes vunder The spring is compressed sideways as shown in Fig. 6, the pressurexonthe spring acting at an agle and not directly .alongithe axis of the pin, with the result that the thick place in the yarn is permitted .to pass strain on the through thentension device without interruption or strain on the yarn :by this slight tilting of-disk :8, and t e slight sideways compression of the spring. Yllie desired result is effected, therefore, Without lifting the whole: disk and without lifting the weights and overcoming the inertia of the .veights, which would brdinajiily in-VQllle a,

yarn. v a

The fact that the Whole disk 8 need not be lifted and that the inertia of the weights need not he overcome when. an uneven place.

or an uneven strain comeson the yarn, permits' a quick and delicate response to, changes in the yarn. Similarly, when the {traverse mechanism changes its direction-of motion,

and whenever-there is any change in tension on the y1,I11'tl16I'( 11S-fl/ quick and delicate response and the sprlngacts as a shock ebsure of the weights.

sorber in avoiding isudtlenchanges in pres- My invention retains :the advantages of a 'spinni-ng tension:devioe. The yarn byits' frictional contact with the disk 8 causes the i cup to spinrapidly, the 'mtaryinotion being tension of :the yarn and is in cleaning the yarn.

transmitted by means ofQ-ztrlictio-n :i-o the spring 9 and thence to the disk 11, if used, and to the weights "12, 12. Ilhis spinning of the tension" device assists in evening the {of importance Another advantage '-.in my invention rap- -pears in she zthreading operationi If there were no such :tiltingand yielding members j as the disk '8 and the spring 9,-it-wouldbe v necessary for the thread or yarn to actuall 91th the diskior the d skiandithe weights 11.

:12 in order. toislide into. plane. device v sa d in Fig. 2. Inother words, the cap makes the device more surely'and positively selt threading."

Another form of my d vice is shaw i {F gs 3. and a. 1 11 thi modi i id term .01 my de ice, as th spring 9 is not tapered- 5 necessary that it should support-the upper cup or clisk'ill which h s a hu er ba 2. o keep ifr m t l i g side ays. Als the spin a is Ushape andthe eights 12 12 :hawe cu 21 y h h hey canine r moved from the pin/l at notch 22.

It will b n ted tha n o hcons ruction shown the force exerted on the ,disks 8 and 8' depend ubs antia y upon the numbe Of weights .on the pin and that the compression on he spring a justa le, no by 0 nut or other devicelbutsimply by the numb of "weights- The nu be .Qf Weigh s ca I Hav ng e ribed y nve t n, v-What desire to claim as new is:-

1 In a tension denies, a support, a pin carried thereon, a disk mounted ,on said pin and resting :on said support, a compression spring restingon said. disk and ,mounted on sa d Pina Said pr g be ng tapere a a point above its base so as to fit the pin close y a said pere po nt and Weig a ounted 0 sa P n {nast ess sa spr n 2 la a tension vdevice, a support, i carrie th mal a disk resting on said support and loosely mounted :on said 'pin, a

compression springmounted' on said pin and resting on said disk, a --weight removehly mounted on said pin and restingdon said spring, and cap lremovably mounted on pin. n v 111 a tension device, a support, a pin c r d thereon, a d sk res ing "Q l. d sup ne t and loo ely ou S d h s, a s nn essio -spr ng m un Q1 said pinian esting Q1 sai disk, a Weight emn a y zm unt dnn said @11 a res ng n said spring, and a cylindrical cap removably mounted on said pin.

4. In a tension device, a support, a pin carried thereon, a concavo-convex cup with its convex face resting on said support, a, compression spring mounted on said pin and with its base resting on the concave surface of said cup, a plurality of removable Weights mounted on said pin and resting on said spring, and a cylindrical cap covering said 10 spring and Weights.

In Witness whereof I have signed my name to the foregoing specification in the presence of two Witnesses.

ROBERT E. NAUMBUR-G.

Witnesses:

J. L. STACKPOILE, H. M. HOLMES. 

